Step motor driving circuit

Details Step motor driving circuit Step motor driving circuit

1983-09-30

1985-03-19

Witkowski, S. J.

Electricity: motive power systems

Open-loop stepping motor control systems

318685, H02K 2904

Patent

active

045062072

ABSTRACT:
A step motor driving circuit, wherein the motor has two pairs of magnetically coupled windings (1, 2 and 3, 4) and includes switching transistors (9, 10, 11, 12) associated to the windings, diodes (15, 16, 17, 18) in parallel to the switching transistors for the recycle of the current induced during the possible current chopping and the phase switching, and a diode (6-8) and a capacitor (5-7), in parallel to each other and series connected between the voltage source, and each pair of magnetically coupled windings. When a phase is de-energized, the driving circuit allows the recovery of the energy stored in such phase by charging the capacitor coupled to it. From such capacitor the energy is then returned to the phase magnetically coupled to the previous one in case of phase switching or to the same phase in case of current chopping. The driving circuit speeds up the phase switching and therefore increases the torque delivered by the motor at high frequencies.

REFERENCES:
patent: 4253052 (1981-02-01), Meier

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